Abstract
Susceptibility and specific heat measurements have been carried out down to 23 mK on polycrystalline [Cu3(titmb)2(OCOCH3)6]⋅H2O {titmb = 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6 trimethylbenzene} with S=1/2 antiferromagnet on Kagome lattice. The results show an unexpected ferromagnetic long range ordering at 56 mK. The entropy change from 10 K to 23 mK is much larger than the entropy corresponding to electron spin S=1/2 of Cu2+. The large excess entropy reduction strongly suggests a novel magnetic ordering of the coupled Cu electron and nuclear spin (I=3/2) system. We propose that a frustrated ground state changes to the complex ferromagnetic ground state with help of the enhanced indirect nuclear spin interaction through the hyperfine interaction.
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